Year	per person
1800	1.756
1820	1.756
1913	2.135
1950	2.307
1951	2.392
1952	2.419
1953	2.462
1954	2.548
1955	2.575
1956	2.616
1957	2.656
1958	2.672
1959	2.763
1960	2.932
1961	2.896
1962	3.085
1963	3.654
1964	3.839
1965	3.759
1966	4.051
1967	4.114
1968	4.009
1969	3.964
1970	4.154
1971	4.753
1972	4.249
1973	3.662
1974	4.344
1975	3.311
1976	2.848
1977	2.571
1978	2.582
1979	2.568
1980	2.65
1981	2.736
1982	2.779
1983	2.814
1984	2.831
1985	2.844
1986	2.844
1987	2.886
1988	2.933
1989	2.859
1990	2.822
1991	2.594
1992	2.734
1993	2.735
1994	2.514
1995	2.652
1996	2.54
1997	2.574
1998	2.519
1999	2.495
2000	2.392
2001	2.376
2002	2.359
2003	2.349
2004	2.375
2005	2.331
2006	2.312
2007	2.275
2008	2.25
2009	2.229